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Diffstat (limited to 'drivers/sh/clk/cpg.c')
-rw-r--r--drivers/sh/clk/cpg.c77
1 files changed, 48 insertions, 29 deletions
diff --git a/drivers/sh/clk/cpg.c b/drivers/sh/clk/cpg.c
index 91b6d52f74e..f0d015dd0fe 100644
--- a/drivers/sh/clk/cpg.c
+++ b/drivers/sh/clk/cpg.c
@@ -2,6 +2,7 @@
* Helper routines for SuperH Clock Pulse Generator blocks (CPG).
*
* Copyright (C) 2010 Magnus Damm
+ * Copyright (C) 2010 - 2012 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
@@ -13,26 +14,44 @@
#include <linux/io.h>
#include <linux/sh_clk.h>
-static int sh_clk_mstp32_enable(struct clk *clk)
+static unsigned int sh_clk_read(struct clk *clk)
{
- iowrite32(ioread32(clk->mapped_reg) & ~(1 << clk->enable_bit),
- clk->mapped_reg);
+ if (clk->flags & CLK_ENABLE_REG_8BIT)
+ return ioread8(clk->mapped_reg);
+ else if (clk->flags & CLK_ENABLE_REG_16BIT)
+ return ioread16(clk->mapped_reg);
+
+ return ioread32(clk->mapped_reg);
+}
+
+static void sh_clk_write(int value, struct clk *clk)
+{
+ if (clk->flags & CLK_ENABLE_REG_8BIT)
+ iowrite8(value, clk->mapped_reg);
+ else if (clk->flags & CLK_ENABLE_REG_16BIT)
+ iowrite16(value, clk->mapped_reg);
+ else
+ iowrite32(value, clk->mapped_reg);
+}
+
+static int sh_clk_mstp_enable(struct clk *clk)
+{
+ sh_clk_write(sh_clk_read(clk) & ~(1 << clk->enable_bit), clk);
return 0;
}
-static void sh_clk_mstp32_disable(struct clk *clk)
+static void sh_clk_mstp_disable(struct clk *clk)
{
- iowrite32(ioread32(clk->mapped_reg) | (1 << clk->enable_bit),
- clk->mapped_reg);
+ sh_clk_write(sh_clk_read(clk) | (1 << clk->enable_bit), clk);
}
-static struct sh_clk_ops sh_clk_mstp32_clk_ops = {
- .enable = sh_clk_mstp32_enable,
- .disable = sh_clk_mstp32_disable,
+static struct sh_clk_ops sh_clk_mstp_clk_ops = {
+ .enable = sh_clk_mstp_enable,
+ .disable = sh_clk_mstp_disable,
.recalc = followparent_recalc,
};
-int __init sh_clk_mstp32_register(struct clk *clks, int nr)
+int __init sh_clk_mstp_register(struct clk *clks, int nr)
{
struct clk *clkp;
int ret = 0;
@@ -40,7 +59,7 @@ int __init sh_clk_mstp32_register(struct clk *clks, int nr)
for (k = 0; !ret && (k < nr); k++) {
clkp = clks + k;
- clkp->ops = &sh_clk_mstp32_clk_ops;
+ clkp->ops = &sh_clk_mstp_clk_ops;
ret |= clk_register(clkp);
}
@@ -72,7 +91,7 @@ static unsigned long sh_clk_div6_recalc(struct clk *clk)
clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
table, NULL);
- idx = ioread32(clk->mapped_reg) & 0x003f;
+ idx = sh_clk_read(clk) & 0x003f;
return clk->freq_table[idx].frequency;
}
@@ -98,10 +117,10 @@ static int sh_clk_div6_set_parent(struct clk *clk, struct clk *parent)
if (ret < 0)
return ret;
- value = ioread32(clk->mapped_reg) &
+ value = sh_clk_read(clk) &
~(((1 << clk->src_width) - 1) << clk->src_shift);
- iowrite32(value | (i << clk->src_shift), clk->mapped_reg);
+ sh_clk_write(value | (i << clk->src_shift), clk);
/* Rebuild the frequency table */
clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
@@ -119,10 +138,10 @@ static int sh_clk_div6_set_rate(struct clk *clk, unsigned long rate)
if (idx < 0)
return idx;
- value = ioread32(clk->mapped_reg);
+ value = sh_clk_read(clk);
value &= ~0x3f;
value |= idx;
- iowrite32(value, clk->mapped_reg);
+ sh_clk_write(value, clk);
return 0;
}
@@ -133,9 +152,9 @@ static int sh_clk_div6_enable(struct clk *clk)
ret = sh_clk_div6_set_rate(clk, clk->rate);
if (ret == 0) {
- value = ioread32(clk->mapped_reg);
+ value = sh_clk_read(clk);
value &= ~0x100; /* clear stop bit to enable clock */
- iowrite32(value, clk->mapped_reg);
+ sh_clk_write(value, clk);
}
return ret;
}
@@ -144,10 +163,10 @@ static void sh_clk_div6_disable(struct clk *clk)
{
unsigned long value;
- value = ioread32(clk->mapped_reg);
+ value = sh_clk_read(clk);
value |= 0x100; /* stop clock */
value |= 0x3f; /* VDIV bits must be non-zero, overwrite divider */
- iowrite32(value, clk->mapped_reg);
+ sh_clk_write(value, clk);
}
static struct sh_clk_ops sh_clk_div6_clk_ops = {
@@ -182,7 +201,7 @@ static int __init sh_clk_init_parent(struct clk *clk)
return -EINVAL;
}
- val = (ioread32(clk->mapped_reg) >> clk->src_shift);
+ val = (sh_clk_read(clk) >> clk->src_shift);
val &= (1 << clk->src_width) - 1;
if (val >= clk->parent_num) {
@@ -252,7 +271,7 @@ static unsigned long sh_clk_div4_recalc(struct clk *clk)
clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
table, &clk->arch_flags);
- idx = (ioread32(clk->mapped_reg) >> clk->enable_bit) & 0x000f;
+ idx = (sh_clk_read(clk) >> clk->enable_bit) & 0x000f;
return clk->freq_table[idx].frequency;
}
@@ -270,15 +289,15 @@ static int sh_clk_div4_set_parent(struct clk *clk, struct clk *parent)
*/
if (parent->flags & CLK_ENABLE_ON_INIT)
- value = ioread32(clk->mapped_reg) & ~(1 << 7);
+ value = sh_clk_read(clk) & ~(1 << 7);
else
- value = ioread32(clk->mapped_reg) | (1 << 7);
+ value = sh_clk_read(clk) | (1 << 7);
ret = clk_reparent(clk, parent);
if (ret < 0)
return ret;
- iowrite32(value, clk->mapped_reg);
+ sh_clk_write(value, clk);
/* Rebiuld the frequency table */
clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
@@ -295,10 +314,10 @@ static int sh_clk_div4_set_rate(struct clk *clk, unsigned long rate)
if (idx < 0)
return idx;
- value = ioread32(clk->mapped_reg);
+ value = sh_clk_read(clk);
value &= ~(0xf << clk->enable_bit);
value |= (idx << clk->enable_bit);
- iowrite32(value, clk->mapped_reg);
+ sh_clk_write(value, clk);
if (d4t->kick)
d4t->kick(clk);
@@ -308,13 +327,13 @@ static int sh_clk_div4_set_rate(struct clk *clk, unsigned long rate)
static int sh_clk_div4_enable(struct clk *clk)
{
- iowrite32(ioread32(clk->mapped_reg) & ~(1 << 8), clk->mapped_reg);
+ sh_clk_write(sh_clk_read(clk) & ~(1 << 8), clk);
return 0;
}
static void sh_clk_div4_disable(struct clk *clk)
{
- iowrite32(ioread32(clk->mapped_reg) | (1 << 8), clk->mapped_reg);
+ sh_clk_write(sh_clk_read(clk) | (1 << 8), clk);
}
static struct sh_clk_ops sh_clk_div4_clk_ops = {